Two buses A and B are travelling along a straight line in the same direction with speeds 50 kmph and 30 kmph The velocity of A

Question

Two buses A and B are travelling along a straight line in the same direction with speeds 50 kmph and 30 kmph The velocity of A relative to B is 1 20 kmph 2 30 kmph 3 60 kmph 4 50 kmph

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